package com.ckx.电脑;

public class Computer {
    public void open() {
        System.out.println("开机");}

    public void close() {
        System.out.println("关机");
    }

    public void useUSBDevice(USB usb) {
        usb.openDevice();
        if (usb instanceof Mouse) {
            Mouse mouse = (Mouse) usb;
            mouse.click();
        } else {
            KeyBoard keyBoard = (KeyBoard) usb;
            keyBoard.input();
        }
        usb.closeDevice();
    }

}
